What I can't understand is that there are many airports in the world which have reduced visibiity due to pollution e.g. Dehli, Hong Kong etc - the pollution particles causing the restriction in visibility.
However, I can sit here in Scotland on a beautiful fresh Sunday morning with clear blue skies and unlimited visibiility in every direction but according to the met office I am covered by an ash cloud - are we actually saying that the ash particles don't restrict visibility in any way at all ?????????